†Biformitetradium Li 1982

Li 1982. Phylum Coelenterata. Class Anthozoa. Subclass Tabulata. Xibei diqu gu shengwu tuce: Shaan-Gan-Ning fence. [Paleontological atlas of Northwest China. Shaanxi-Gansu-Ninxia Volume. Part 1. Precambrian and Early Paleozoic], Geological Publishing House, Peking, 1982: 3-11. Chapter pagination: 50-93